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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = x/49 // - x/49
4/x-(x/49) = 0
4*x^-1-1/49*x^1 = 0
(4*x^0-1/49*x^2)/(x^1) = 0 // * x^2
x^1*(4*x^0-1/49*x^2) = 0
x^1
(-1/49)*x^2+4 = 0
(-1/49)*x^2+4 = 0
DELTA = 0^2-(4*4*(-1/49))
DELTA = 16/49
DELTA > 0
x = ((16/49)^(1/2)+0)/(2*(-1/49)) or x = (0-(16/49)^(1/2))/(2*(-1/49))
x = -14 or x = 14
x in { -14, 14}
x in { -14, 14 }
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